Buffer apparatus for providing data transfer with the memory of a data processing system





1. IN A DATA PROCESSING SYSTEM, A DATA STORAGE UNIT FOR STORING A PLURALITY OF DATA ITEMS IN FORM SATISFYING A PREDETERMINED CRITERION, A FIRST REGISTER FOR STORING A DATA ITEM, MEANS FOR TRANSFERRING A DATA ITEM FROM SAID DATA STORAGE UNIT TO SAID FIRST REGISTER, A SECOND REGISTER FOR STORING A DATA ITEM, MEANS FOR TRANSFERRING THE CONTENTS OF SAID FIRST REGISTER TO SAID SECOND REGISTER, A DATA PROCESSING UNIT ADAPTED TO PERFORM OPERATIONS ON DATA ITEMS RECEIVED THEREBY, MEANS FOR PROVIDING A CONTROL SIGNAL, MEANS RESPONSIVE TO SAID CONTROL SIGNAL FOR TRANSFERRING A REPRESENTATION OF THE CONTENTS OF SAID SECOND REGISTER TO SAID DATA PROCESSING UNIT, AND MEANS RESPONSIVE TO SAID CONTROL SIGNAL FOR VERIFYING THE SATISFACTION OF SAID PREDETERMINED CRITERION BY DATA ITEMS IN SAID SECOND REGISTER. 